Shadowstitch-[AUTO](RC):[Retire this unit] At the end of the battle that this unit attacked a vanguard, if that attack did not hit, you may pay the cost. If you do, choose one of your grade 1 or 3 rear-guards, search your deck for up to one card with the same card name as that unit, call it to (RC), shuffle your deck, and at the end of that turn, put the unit called with this effect on the bottom of your deck.